About Scope, Compensate, and Throw

The Scope, Compensate, and Throw steps in the Step Palette deserve special mention. These steps are related and are used to create a structure for handling faults that occur during Web-service execution.

• The Scope step makes it possible to have a FaultHandler and a CompensationHandler.
• The Compensate step is designed to work with a CompensationHandler or FaultHandler to roll back actions from an entire scope. You can use the Compensate step in one of two ways:
  • If you name a scope explicitly in the step Property Editor, then only the named scope's CompensationHandler is invoked.
  • If you do not name a scope in the step Property Editor, then every CompensationHandler for scopes enclosed immediately within the scope of the Compensate step is invoked, in reverse order of execution.
• The Throw step is used inside a nested scope to pass the exception or fault to the outer scope.